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UNITED b rarns PATENT Grinch.

GEORGE It. KING, OF NEW BRIGHTON, NEYV Xtllil'l.

COMPOUNDTO RESTRAIN THE SETTlNG OF PLASTER.

SPECIFICATION forming part of Letters Patent No.368,594, date-r1 August 23, 1887 Application filed Mn 14, 1887. Serial K0. 238,193. (No specimens To all whom it may concern! Be it known that I, GEORGE R. KING, a rcsi 5 dent of New Brighton, eountyof Richmond,- and State of New York, and a citizen of the United States, have made a new and useful Invention in Compounds to Restraiu the Setting of Plaster and the Like; and the following is a full, clear, and exact description of the same, which will enable others to practice the same.

In the use ofplaster-of-paris and other materials which set by reason of the same causes, it is very desirable to be able to restrain the setting action, so that a slow setting may he had, when desired, instead of the usual rapid setting of the material. To accomplish this,

plaster has been mixed with glue-water; but

'was not satisfactory.

this gave very uneven results, and on the whole It has also been at tempted to mix powdered glue with plaster and then mix the two powdered materials with water; but this gives a still more unsatisfactory result, and in practice proved totally use less. i

My invention consists in a process and a product. The latter can be mixed with plaster or other materials that have a kindred setting action, and the quantity of my material that is used will govern the setting action of the plaster or like material with which it is mixed.

I proceed in the practice of my process as follows: I take any stone or stone-like material-such as marble, chalk, plaster, or the like. (I prefer marble, preferably white) and I powder it so that it will pass through, say, a No. 16 bolting-cloth. I then (although this is not an essential step in the process or in the production of my article) submit this powdered mass to a temperature of from 250 to 400" Fahrenheit. I next dissolve, preferably, glue in water, though many other animal, gelatinous, or vegetable glutinous substances will do. I prefer, however, glue. I next mix the finely-ground stone-powder with the glue-wat-er. More or less glue can be used, as desired. To make what I call a stronger product, more glue is used; to make a less strong product, less glue is usedsay two pounds of glue may be dissolved in about a paill'ul of water. This iluid mass will wet about a certain amount of ground stone, not much more or less, so as to i'orm a pasty mass. This pasty mass 1 then dry, say byartificia'l heat at aisemperature of about 200 Fahrenheit, and the result will be a'eomparatively hard stone-like mass. Narious drying methods may be used. I next powother way, and preferably bolt it through about a No. 16 mesh cloth. This mass may again be heated, if desired, to drive off any further moisture, such heating being advantageous rather than hurtful, but not being an essential step in my process. When this is done, my article,whichl call a rest rainer, is ready for use. It may be used alone if an exceedingly slow-setting mass is desired, or it may be added to any plaster or like material in any desired quantity to restrain the setting action. Thus if my restraincr, for example, is added to common plastcr-ofparis, even in such small quantities as to amount to one pound of the restrainer to fifty pounds of plaster, a rest raining effect will be had. cases to mix the powdered restrainer with the powdered plaster or equivalent substances while both are in the dry and fine y-powdered con'ditionand then add the water. This restrainer is very useful in making a hard surface for walls and the like, and for numerous other purposes.

What I claim, and desire to secure by Letters Patent, is-

1. lhe process herein described, which coir sists in mixing with water containing a gelui i -nous or glutinous substance a powdered stem,

hardening the same into a stone-like mass, and then rcgrinding this stone-like mass, substantially as described.

2. The proc'css herein descTribcd, which conan artificiallydried powder made by grinding stone,allowing the same to harden,and then regrinding the mass, substantially as described.

3. The process herein described, which conhle, drying the same into a hard mass, and regrinding the same, substantially as described.

4. As a new article of manufacture, a restrainer, substantially as herein deseribcd,con-

sisting of glue and ground stone, combined in the manner set forth.

' one. It. KING.

Witnesses:

Tnos. BALE, H. BIGNELL.

der this stone-like mass by grinding or in any sists in mixing with glue dissolved in water 9 sists in mixing with glue-water powdered mar- 

